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|
use std::env;
use std::fmt::Display;
use std::fs;
use std::io;
use std::io::{BufRead, BufReader};
use std::mem;
use std::os::unix::io::AsRawFd;
use std::ptr;
use std::str;
use crate::kb::Key;
use crate::term::Term;
pub use crate::common_term::*;
pub const DEFAULT_WIDTH: u16 = 80;
#[inline]
pub fn is_a_terminal(out: &Term) -> bool {
unsafe { libc::isatty(out.as_raw_fd()) != 0 }
}
pub fn is_a_color_terminal(out: &Term) -> bool {
if !is_a_terminal(out) {
return false;
}
if env::var("NO_COLOR").is_ok() {
return false;
}
match env::var("TERM") {
Ok(term) => term != "dumb",
Err(_) => false,
}
}
pub fn c_result<F: FnOnce() -> libc::c_int>(f: F) -> io::Result<()> {
let res = f();
if res != 0 {
Err(io::Error::last_os_error())
} else {
Ok(())
}
}
pub fn terminal_size(out: &Term) -> Option<(u16, u16)> {
unsafe {
if libc::isatty(libc::STDOUT_FILENO) != 1 {
return None;
}
let mut winsize: libc::winsize = std::mem::zeroed();
// FIXME: ".into()" used as a temporary fix for a libc bug
// https://github.com/rust-lang/libc/pull/704
#[allow(clippy::useless_conversion)]
libc::ioctl(out.as_raw_fd(), libc::TIOCGWINSZ.into(), &mut winsize);
if winsize.ws_row > 0 && winsize.ws_col > 0 {
Some((winsize.ws_row as u16, winsize.ws_col as u16))
} else {
None
}
}
}
pub fn read_secure() -> io::Result<String> {
let f_tty;
let fd = unsafe {
if libc::isatty(libc::STDIN_FILENO) == 1 {
f_tty = None;
libc::STDIN_FILENO
} else {
let f = fs::OpenOptions::new()
.read(true)
.write(true)
.open("/dev/tty")?;
let fd = f.as_raw_fd();
f_tty = Some(BufReader::new(f));
fd
}
};
let mut termios = core::mem::MaybeUninit::uninit();
c_result(|| unsafe { libc::tcgetattr(fd, termios.as_mut_ptr()) })?;
let mut termios = unsafe { termios.assume_init() };
let original = termios;
termios.c_lflag &= !libc::ECHO;
c_result(|| unsafe { libc::tcsetattr(fd, libc::TCSAFLUSH, &termios) })?;
let mut rv = String::new();
let read_rv = if let Some(mut f) = f_tty {
f.read_line(&mut rv)
} else {
io::stdin().read_line(&mut rv)
};
c_result(|| unsafe { libc::tcsetattr(fd, libc::TCSAFLUSH, &original) })?;
read_rv.map(|_| {
let len = rv.trim_end_matches(&['\r', '\n'][..]).len();
rv.truncate(len);
rv
})
}
fn poll_fd(fd: i32, timeout: i32) -> io::Result<bool> {
let mut pollfd = libc::pollfd {
fd,
events: libc::POLLIN,
revents: 0,
};
let ret = unsafe { libc::poll(&mut pollfd as *mut _, 1, timeout) };
if ret < 0 {
Err(io::Error::last_os_error())
} else {
Ok(pollfd.revents & libc::POLLIN != 0)
}
}
#[cfg(target_os = "macos")]
fn select_fd(fd: i32, timeout: i32) -> io::Result<bool> {
unsafe {
let mut read_fd_set: libc::fd_set = mem::zeroed();
let mut timeout_val;
let timeout = if timeout < 0 {
ptr::null_mut()
} else {
timeout_val = libc::timeval {
tv_sec: (timeout / 1000) as _,
tv_usec: (timeout * 1000) as _,
};
&mut timeout_val
};
libc::FD_ZERO(&mut read_fd_set);
libc::FD_SET(fd, &mut read_fd_set);
let ret = libc::select(
fd + 1,
&mut read_fd_set,
ptr::null_mut(),
ptr::null_mut(),
timeout,
);
if ret < 0 {
Err(io::Error::last_os_error())
} else {
Ok(libc::FD_ISSET(fd, &read_fd_set))
}
}
}
fn select_or_poll_term_fd(fd: i32, timeout: i32) -> io::Result<bool> {
// There is a bug on macos that ttys cannot be polled, only select()
// works. However given how problematic select is in general, we
// normally want to use poll there too.
#[cfg(target_os = "macos")]
{
if unsafe { libc::isatty(fd) == 1 } {
return select_fd(fd, timeout);
}
}
poll_fd(fd, timeout)
}
fn read_single_char(fd: i32) -> io::Result<Option<char>> {
// timeout of zero means that it will not block
let is_ready = select_or_poll_term_fd(fd, 0)?;
if is_ready {
// if there is something to be read, take 1 byte from it
let mut buf: [u8; 1] = [0];
read_bytes(fd, &mut buf, 1)?;
Ok(Some(buf[0] as char))
} else {
//there is nothing to be read
Ok(None)
}
}
// Similar to libc::read. Read count bytes into slice buf from descriptor fd.
// If successful, return the number of bytes read.
// Will return an error if nothing was read, i.e when called at end of file.
fn read_bytes(fd: i32, buf: &mut [u8], count: u8) -> io::Result<u8> {
let read = unsafe { libc::read(fd, buf.as_mut_ptr() as *mut _, count as usize) };
if read < 0 {
Err(io::Error::last_os_error())
} else if read == 0 {
Err(io::Error::new(
io::ErrorKind::UnexpectedEof,
"Reached end of file",
))
} else if buf[0] == b'\x03' {
Err(io::Error::new(
io::ErrorKind::Interrupted,
"read interrupted",
))
} else {
Ok(read as u8)
}
}
fn read_single_key_impl(fd: i32) -> Result<Key, io::Error> {
loop {
match read_single_char(fd)? {
Some('\x1b') => {
// Escape was read, keep reading in case we find a familiar key
break if let Some(c1) = read_single_char(fd)? {
if c1 == '[' {
if let Some(c2) = read_single_char(fd)? {
match c2 {
'A' => Ok(Key::ArrowUp),
'B' => Ok(Key::ArrowDown),
'C' => Ok(Key::ArrowRight),
'D' => Ok(Key::ArrowLeft),
'H' => Ok(Key::Home),
'F' => Ok(Key::End),
'Z' => Ok(Key::BackTab),
_ => {
let c3 = read_single_char(fd)?;
if let Some(c3) = c3 {
if c3 == '~' {
match c2 {
'1' => Ok(Key::Home), // tmux
'2' => Ok(Key::Insert),
'3' => Ok(Key::Del),
'4' => Ok(Key::End), // tmux
'5' => Ok(Key::PageUp),
'6' => Ok(Key::PageDown),
'7' => Ok(Key::Home), // xrvt
'8' => Ok(Key::End), // xrvt
_ => Ok(Key::UnknownEscSeq(vec![c1, c2, c3])),
}
} else {
Ok(Key::UnknownEscSeq(vec![c1, c2, c3]))
}
} else {
// \x1b[ and 1 more char
Ok(Key::UnknownEscSeq(vec![c1, c2]))
}
}
}
} else {
// \x1b[ and no more input
Ok(Key::UnknownEscSeq(vec![c1]))
}
} else {
// char after escape is not [
Ok(Key::UnknownEscSeq(vec![c1]))
}
} else {
//nothing after escape
Ok(Key::Escape)
};
}
Some(c) => {
let byte = c as u8;
let mut buf: [u8; 4] = [byte, 0, 0, 0];
break if byte & 224u8 == 192u8 {
// a two byte unicode character
read_bytes(fd, &mut buf[1..], 1)?;
Ok(key_from_utf8(&buf[..2]))
} else if byte & 240u8 == 224u8 {
// a three byte unicode character
read_bytes(fd, &mut buf[1..], 2)?;
Ok(key_from_utf8(&buf[..3]))
} else if byte & 248u8 == 240u8 {
// a four byte unicode character
read_bytes(fd, &mut buf[1..], 3)?;
Ok(key_from_utf8(&buf[..4]))
} else {
Ok(match c {
'\n' | '\r' => Key::Enter,
'\x7f' => Key::Backspace,
'\t' => Key::Tab,
'\x01' => Key::Home, // Control-A (home)
'\x05' => Key::End, // Control-E (end)
'\x08' => Key::Backspace, // Control-H (8) (Identical to '\b')
_ => Key::Char(c),
})
};
}
None => {
// there is no subsequent byte ready to be read, block and wait for input
// negative timeout means that it will block indefinitely
match select_or_poll_term_fd(fd, -1) {
Ok(_) => continue,
Err(_) => break Err(io::Error::last_os_error()),
}
}
}
}
}
pub fn read_single_key() -> io::Result<Key> {
let tty_f;
let fd = unsafe {
if libc::isatty(libc::STDIN_FILENO) == 1 {
libc::STDIN_FILENO
} else {
tty_f = fs::OpenOptions::new()
.read(true)
.write(true)
.open("/dev/tty")?;
tty_f.as_raw_fd()
}
};
let mut termios = core::mem::MaybeUninit::uninit();
c_result(|| unsafe { libc::tcgetattr(fd, termios.as_mut_ptr()) })?;
let mut termios = unsafe { termios.assume_init() };
let original = termios;
unsafe { libc::cfmakeraw(&mut termios) };
termios.c_oflag = original.c_oflag;
c_result(|| unsafe { libc::tcsetattr(fd, libc::TCSADRAIN, &termios) })?;
let rv: io::Result<Key> = read_single_key_impl(fd);
c_result(|| unsafe { libc::tcsetattr(fd, libc::TCSADRAIN, &original) })?;
// if the user hit ^C we want to signal SIGINT to outselves.
if let Err(ref err) = rv {
if err.kind() == io::ErrorKind::Interrupted {
unsafe {
libc::raise(libc::SIGINT);
}
}
}
rv
}
pub fn key_from_utf8(buf: &[u8]) -> Key {
if let Ok(s) = str::from_utf8(buf) {
if let Some(c) = s.chars().next() {
return Key::Char(c);
}
}
Key::Unknown
}
#[cfg(not(target_os = "macos"))]
lazy_static::lazy_static! {
static ref IS_LANG_UTF8: bool = match std::env::var("LANG") {
Ok(lang) => lang.to_uppercase().ends_with("UTF-8"),
_ => false,
};
}
#[cfg(target_os = "macos")]
pub fn wants_emoji() -> bool {
true
}
#[cfg(not(target_os = "macos"))]
pub fn wants_emoji() -> bool {
*IS_LANG_UTF8
}
pub fn set_title<T: Display>(title: T) {
print!("\x1b]0;{}\x07", title);
}
|